#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

ll gcd(ll a, ll b, ll& x, ll& y) {
  if (b == 0) {
    x = 1, y = 0;
    return a;
  }
  ll d = gcd(b, a % b, y, x);
  y -= a / b * x;
  return d;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  ll x, y, m, n, L;
  cin >> x >> y >> m >> n >> L;
  if (m < n) swap(m, n), swap(x, y);
  m -= n, y -= x;
  y %= L;
  if (y < 0) y += L;
  ll u, v;
  ll d = gcd(m, L, u, v);
  if (y % d) {
    cout << "Impossible";
    return 0;
  }
  m /= d, L /= d, y /= d;
  u = u * y % L;
  if (u < 0) u += L;
  cout << u;
  return 0;
}